Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 155/55-15 | 185/80-15 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 21.71 (551.5) | 26.65 (677) | 4.94 (125.5) 22.8% |
| Width inches (mm) | 6.1 (155) | 7.28 (185) | 1.18 (30) 19.4% |
| Circum. inches (mm) | 68.21 (1732.59) | 83.73 (2126.86) | 15.52 (394.27) 22.8% |
| Sidewall Height inches (mm) | 3.36 (85.25) | 5.83 (148) | 2.47 (62.75) 73.6% |
| Revolutions per mile (km) | 928.87 (577.17) | 756.68 (470.18) | -172.19 (-106.99) -18.5% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 24.55 mph (39.51 km/h) |
| 25 mph (40.23 km/h) | 30.69 mph (49.39 km/h) |
| 30 mph (48.28 km/h) | 36.83 mph (59.27 km/h) |
| 35 mph (56.33 km/h) | 42.96 mph (69.15 km/h) |
| 40 mph (64.37 km/h) | 49.1 mph (79.02 km/h) |
| 45 mph (72.42 km/h) | 55.24 mph (88.9 km/h) |
| 50 mph (80.47 km/h) | 61.38 mph (98.78 km/h) |
| 55 mph (88.51 km/h) | 67.52 mph (108.66 km/h) |
| 60 mph (96.56 km/h) | 73.65 mph (118.53 km/h) |
| 65 mph (104.61 km/h) | 79.79 mph (128.41 km/h) |
| 70 mph (112.65 km/h) | 85.93 mph (138.29 km/h) |
| 75 mph (120.7 km/h) | 92.07 mph (148.17 km/h) |
| 80 mph (128.75 km/h) | 98.2 mph (158.05 km/h) |
| 85 mph (136.79 km/h) | 104.34 mph (167.92 km/h) |
| 90 mph (144.84 km/h) | 110.48 mph (177.8 km/h) |
| 95 mph (152.89 km/h) | 116.62 mph (187.68 km/h) |
| 100 mph (160.93 km/h) | 122.76 mph (197.56 km/h) |
| 2.35 | 2.73 | 2.94 | 3.07 | 3.21 | 3.31 | 3.42 | 3.55 | 3.73 | 3.91 | 4.11 | 4.27 | 4.56 | 4.88 | 5.13 | 5.29 | 5.38 | 5.71 | 6.17 | 7.17 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1926 | 2237 | 2409 | 2516 | 2630 | 2712 | 2802 | 2909 | 3056 | 3204 | 3368 | 3499 | 3736 | 3999 | 4204 | 4335 | 4408 | 4679 | 5056 | 5875 |
Better Fuel Economy Factory Ratios Increased Power
